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SM8760CA Datasheet(PDF) 5 Page - Nippon Precision Circuits Inc

Part No. SM8760CA
Description  Spread Spectrum Clock Generator
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Maker  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
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SM8760CA Datasheet(HTML) 5 Page - Nippon Precision Circuits Inc

   
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SM8760CA
SEIKO NPC CORPORATION —5
FUNCTIONAL DESCRIPTION
Master Clock
The SM8760CA master clock can be generated by the crystal oscillator formed by connecting a crystal (funda-
mental mode) between XT (pin 1) and XTN (pin 2) as shown in Figure 2. Alternatively, an external master
clock can be input directly on XT (pin 1) as shown in Figure 3. If an external clock is input on XT, it is recom-
mended that the clock have 50% duty and VDD level voltage amplitude. Note that the input clock amplitude
voltage must not exceed the absolute maximum rating, otherwise it may cause the SM8760CA to breakdown.
Function Controls
The SM8760CA power-down and SS modulation ON/OFF functions are controlled using the PDN and ENS
input pins as shown in Table 1.
The power-down function is controlled using the PDN input pin. When PDN (pin 3) is “H”, normal operating
mode is selected. When PDN is “L”, power-down mode is selected. In power-down mode, the CLKOUT and
REFOUT output pins are in a high impedance state.
The SS modulation function is controlled using the ENS input pin. When ENS (pin 4) is “H”, the SS modula-
tion function is ON, and an SS-modulated clock is output on the CLKOUT pin. When ON, the modulation
mode and amplitude is a fixed center spread modulation
± 1.0%. When ENS is “L”, the SS modulation func-
tion is OFF.
Note. “H” signal represents VDD level, and “L” represents VSS level.
Figure 2. Crystal element connection
Oscillator
Internal
Circuits
XT (Pin1)
XTN (Pin2)
C1
C2
C1, C2 = 5 to 33pF
Figure 3. External clock input
Oscillator
Internal
Circuits
XT (Pin1)
XTN (Pin2)
Open
External Clock
Table 1. Function summary
PDN (Pin 3)
ENS (Pin 4)
Power Down
Output (Pin 5, Pin 7)
SS ON/OFF
SS Mode
SS Modulation [%]
HH
OFF
Clock out
ON
Center spread
± 1.0
H
L
OFF
0.0
LH
ON
Hi-Z
−−
LL


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